package com.itheima.myinteger;

public class demo1 {
    public static void main(String[] args) {
        Integer i1 = 100;
        System.out.println("i1 = " + i1);

        int i2 = i1;
        System.out.println("i2 = " + i2);

        Integer i3 = 100;
        i3 += 200;
        System.out.println("i3 = " + i3);

        // Integer i4 = null;
        Integer i4 = 100;

        if (i4!=null) {
            i4 += 100;
            System.out.println("i4 = " + i4);
        }

    }
}
